3Com VCX V7122 User Manual page 108

ini File Field Name
*
Web Parameter Name
CngDetectorMode
[CNG Detector Mode]
DefaultReleaseCause
[Default Release Cause]
IPAlertTimeout
[Tel to IP No Answer
Timeout]
SipSessionExpires
[Session-Expires Time]
MINSE
[Minimum Session-
Expires]
SIPMaxRtx
[SIP Maximum Rtx]
SipT1Rtx
[SIP T1 Retransmission
Timer (msec)]
SipT2Rtx
[SIP T2 Retransmission
Timer (msec)]
108
Valid Range and Description
0 = Don't detect CNG (default).
2 = Detect CNG on caller side and start fax session (if IsFaxUsed=1).
Usually T.38 fax session starts when the "preamble" signal is detected by the
answering side. Some SIP gateways do not support the detection of this fax
signal on the answering side. For these cases it is possible to configure the
gateways to start the T.38 fax session when the CNG tone is detected by the
originating side. However this mode is not recommended.
Default Release Cause (for IP to Tel calls), used when the gateway initiates a
call release, and if an explicit matching cause for this release isn't found, a
default release cause can be configured. The default release cause is
described in the Q.931 notation, and translated to corresponding SIP
equivalent response value.
The default release cause is: NO_ROUTE_TO_DESTINATION (3).
Other common values are: NO_CIRCUIT_AVAILABLE (34) or
DESTINATION_OUT_OF_ORDER (27), etc.
Note: The default release cause is described in the Q.931 notation, and is
translated to corresponding SIP 40x or 50x value. For example: 404 for 3, 503
for 34 and 502 for 27.
For mapping of SIP to Q.931 and Q.931 to SIP release causes, see
Appendix I: Release Reason Mapping
Defines the time (in seconds) the gateway waits for a 200 OK response from
the called party (IP side) after sending an Invite message. If the timer expires,
the call is released.
The valid range is 0 to 3600. The default value is 180.
0 = Not activate (default).
Timeout [seconds] for Keeping a "re-INVITE" message alive within a SIP
session.
Defines the time (in seconds) that is used in the Min-SE header field. This field
defines the minimum time that the user agent supports for session refresh.
The valid range is 10 to 100000. The default value is 90.
Number of UDP retransmissions of SIP messages.
The range is 1 to 7.
The default value is 7.
The time interval (in msec) between the first transmission of a SIP message
and the first retransmission of the same message.
The default is 500.
Note: The time interval between subsequent retransmissions of the same SIP
message starts with SipT1Rtx and is multiplied by two until SipT2Rtx.
For example (assuming that SipT1Rtx = 500 and SipT2Rtx = 4000):
The first retransmission is sent after 500 msec.
The second retransmission is sent after 1000 (2*500) msec.
The third retransmission is sent after 2000 (2*1000) msec.
The fourth retransmission and subsequent retransmissions until SIPMaxRtx
are sent after 4000 (2*2000) msec.
The maximum interval (in msec) between retransmission of SIP messages.
The default is 4000.
Note: The time interval between subsequent retransmissions of the same SIP
message starts with SipT1Rtx and is multiplied by two until SipT2Rtx.
3Com VCX V7122 SIP VoIP Gateway User Manual
on page 233.